using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;namespace 基本语法
{class Program{static void Main(string[] args){Stopwatch watch = new Stopwatch();watch.Start();List<int> list = _GetRandom(20, 500, 400);watch.Stop();int ctrl = 0;foreach (int i in list){Console.Write("{0} ", i);++ctrl;if (ctrl % 20 == 0)Console.WriteLine();}Console.WriteLine("\nMethod 1 time used:{0}", watch.Elapsed);watch.Reset();watch.Start();int[] ia = GetRandom(20, 500, 400);watch.Stop();ctrl = 0;foreach (int i in ia){Console.Write("{0} ", i);++ctrl;if (ctrl % 20 == 0)Console.WriteLine();}Console.WriteLine("\nMethod 2 time used:{0}", watch.Elapsed);}/// <summary>/// 使用list容器产生一定范围内互不相同的随机数/// </summary>/// <param name="minVal">最小值</param>/// <param name="maxVal">最大值</param>/// <param name="amount">随机数总数</param>/// <returns>返回list<int></returns>static List<int> _GetRandom(int minVal, int maxVal, int amount){List<int> list = new List<int>();while (list.Count != amount){Random random = new Random((int)DateTime.Now.Ticks);int temp = random.Next(minVal, maxVal);if (!list.Contains(temp))list.Add(temp);}return list;}/// <summary>/// 使用数组方法实现/// </summary>/// <param name="minVal"></param>/// <param name="maxVal"></param>/// <param name="amout"></param>/// <returns>返回int[]</returns>static int[] GetRandom(int minVal, int maxVal, int amout){int[] result = new int[amout];int[] all = new int[maxVal-minVal+1];for (int ix = 0; ix!=amout;++ix ){all[ix] = minVal + ix;}Random random = new Random();int allNum = all.Length;for (int ix = 0; ix != amout;++ix ){int index=random.Next(allNum);result[ix] = all[index];all[index] = all[--allNum];}return result;}}}